Mac OS X data client for ampsig: the progressive sig
ampsig is a PHP script that generates an image to display select information about your computer. A partial list of possibilities:
ampsig supports "schemes" which allow it to take various colors and forms, enabling you to configure its appearance to your heart's desire (take a look at the examples on the ampsig screenshots page).
macsig is an AppleScript Studio application that communicates with ampsig, feeding it the information to display. It primarily monitors and reports changes in iTunes and optionally sends information about how long your computer has been running.